Roll-grinding machine



J. HARTMAN ROLL GRINDING MACHINE Feb. 23, 1943'."

5 Sheets-Sheet 1 Filed Sept. 50, 1941 Jase Feb. 23, 1943 .1. 'HARTMAN ROLL GRINDING MACHINE Filed Sept. 50, 1941 5 Sheets-Sheet 2 n fllflljinuu lllillllllllllum llllllllfl- Feb. 23, 1943: H TMAN 2,312,161

ROLL GRINDING MACHINE Filed Sept. 50, 1941 5 Sheets-Sheet 3 Feb. 23,. 1943.

J. HARTMAN ROLL GRINDiNG MACHINE Filed Sept. 50, 1941 5 Sheets-Sheet 1 rneys 23, 1943- J. HARTMAN 2,312,161

ROLL GRINDING MACHINE Filed Sept. 30, 1941 5 Sheets-Sheet 5 Patented Feb. 23, 1943 UNITED STATES FTNT OFFICE ROLL- GRINDING MACHINE Joseph Hartman, Grand'Rapids, Mich., assignor to Lobdell Car Wheel'Company, Wilmington, Del., a corporation of Delaware Application September 30, 1941, Serial No. 413,035

11 Claims. (01. 51-49) This invention relates to improvements in rollgrinding machines, and a primary'object of the invention is to'provide a novel in-feed device for the grinding wheels which will automatically maintain the Wheels in cutting engagement with the work and which will thereby afford a high degree of accuracy in the grinding operations.

In U. S. Patent No. 840,879, dated January 8, 1907. a device was disclosed for actuating the grinding wheels so as to give the roll under treatment a slight crown or longitudinal concavity, as might be required. In that case, the wheel-supporting frame or frames were hinged or pivoted so as to be movable towardand from the roll in a plane or'planes at right angles to the axis-of the latter, and means was provided for automatically oscillating the frames in timed relation with their traverse movement. In that case also, the frames were adjustable on the hinges or pivots in relation to the actuating mechanism by means of adjusting screws, and it is these screws which I have utilized'in the present invention to obtain the automatic in-feed hereinafter described.

In the attached drawings:

Figure l is a vertical transverse sectional view of a roll grinding machine constructed in accordance with my invention;

Fig. 2 is an enlarged vertical sectional View showing a'fragment of the right-hand side of the machine as viewed in Fig.1 and illustrating details of the in-feed' mechanism;

Fig. 3 is an enlarged fragmentary side elevationa'i view showing the portion of the machine illustrated in Fig. 2;

Fig. 4 is a'sectio'n on the line 44, Fig. 2;

Fig. 5 is a section on the line 5-5, Fig. 4;

Fig. 6 is 'a view corresponding to Fig. 2 illustrating a modification within the scope of the invention;

Fig. 7 is a top plan view of the mechanism shown in Fig. 6;

Fig.8 is an elevational View of the mechanism shown in Fig. 6, and

Fig. 9 is a section on the line 99, Fig. 8.

With reference to Fig. 1 of the drawings, I is the bed or basic framework of the roll-grinding machine, said bed having guides 2, 2 in which is slidably supported the carriage 3 for the grinding wheels 4 and 5. A feed screw 6 is journaled in the bed I for traversing the carriage 3 in the guides 2. The roll 1, which constitutes the work piece, may be supported between the grinding wheels in any desired manner on structures having no part in the present invention, and, therefore, not illustrated in the drawings.

The wheels 4 and 5 are journaled in frames, 8 and 9 respectively, which frames are pivotally connected at l0 and I to the carriage 3, the axes of said pivotal connections extending axially of the wheels and of the roll 7 whereby the frames 8 and 9 together with the wheels 4 and 5 are capable of movements about the said pivots to and from the roll 1 in planesat right angles to the axis of the latter. The rear end of each of the frames 8 and 9 is supported by a screw l2, said screws being threaded into arms I3 at the rear of the frames and seating upon a suitable support M on the carriage 3. It will be apparent that by adjustment of the screws 2 in the arms l3, the grinding wheels 4 and 5 may be advanced or retracted with respect to the work I. In the present instance the wheels 4 and 5 are driven through the medium of belts |5, |5 from. electric motors 6, l6 mounted in elevated positions upon the pivoted frames 8 and 9.

In accordance with my invention, the head of each of the screws |2 is provided with a helical gear I! which meshes'with a worm |8v on a shaft I9, this shaft being journaled in suitable bearings 20 on the carriage 3. Tothe outer'end of the shaft is secured a ratchet wheel 2|, this'wheel being provided with a handle 22 for manual operation when required. Journaled for free rotation on the shaft I9 is a gear wheel 23 which carries a pivoted pawl 24 for engagement withthe ratchet 2|. By means of the pawl 24, rotational movement of the gear 23 in one direction may be transmitted to the shaft l9.

As shown in Fig. 5, the rear end of the pawl is connected through a fiat spring 25 with one arm 26 of a lever 21 pivotally secured to the gear wheel 23. Another arm, 28, of the'lever 21 extends inwardly at the back of the ratchet wheel 2| to a point near the axis, at which point the web of said wheel is provided with an arcuate slot 29. Journaled on the hub of the gear wheel 23 is a collar 30, and this collar carries a pair of spaced pins 3|, 3| which project through the slot 29 and lie one at each side of the inner end of the arm 28 of the lever 21. When the collar 30 is turned in one direction so as to bring the pins 3!, 3| toward one end of the slot; as shown in Fig. 5, the lever 21 is turned so as to cause the spring 25 to elevate the working end of the pawl 24 from the ratchet 2|, whereby the operative connection between the gear wheel 23 and the ratchet wheel 2| is broken; and adjustment of the sleeve 30 in the opposite direction will have the effect of again engaging the pawl with the ratchet. In order to applyretarding friction to "lever device described above.

the sleeve 30, the hub of the wheel 23 is provided with a spring-pressed ball 32 which bears against the inner periphery of the sleeve 30 in well known manner to thereby frictionally control the movements of the latter. It will be apparent that by disengaging the pawl 24 as described, the shaft l9 may be actuated manually through the handle 22 of the ratchet 2|.

Each of the gear wheels 23 meshes with a rack 33, said racks being supported in guides 34 for longitudinal sliding movement on the carriage 3, The racks 33 are rigidly connected together through the medium of a tie rod 35, and on one end of the tie rod is a spring 35 which by reaction with a suitable abutment on the carriage {3 exerts pressure tending to force the racks to the left as Viewed in Fig. 1. One of the racks '33,

namely, that one which is shown at the right in' Fig. 1, and also in Figs. 2 and 3, is connected through a pivotally attached link 31 with a nut 38, This nut i .adius a ly supported n on arm i a ever 4 whi h lever is pivo ally connected at M to the carriage 3. The not 3.8 is n a ed by a screw 42 rotatably held in the arm .39 and :by :means of which the nut maybe adiustedin the armand respect to the p vot 4|. The other :arm 43 of the lever All carries a roller 44 which enga es :a cam 4-5, said cam being carried by a jack shaft 46 .iournaled in the carriage 3. "The shaft 46 has secured thereto a gear 41, and this gear meshes with a rack :48 on the side of the :bed I, ,A spring 49 is confined under tension between the carriage 3 and the lever 4:0, and exerts resilient pressure on the latter tending to hold the roller 44 against the surface of the cam 45.

It will be apparent that the longitudinal traverse movement of the carriage :3 on the bed .I will result in a rotation through the rack 48 and gear 41 of the cam 45.. This in turn effects an oscillation .of the lever 413 about the pivot 4| anda longitudinal reciprocation through the connecting link 3:! of the rack 13.3. This reciprocation of the rack .33, which by reason .of the cone necting rod :35 is accompanied also by a corresponding reciprocation .of the other of the racks 33 oscillates each of the gears 23, and through the associated pawl 2.4 effects an intermittent rotational movement .of the ratchets '21, the shafts 19 and the screws l2. These movements of the screws 12 will .efiect .a gradual feeding-in of the grinding wheels .4 and :5, the extent .of the in-feed depending in part .on the diameters of and the number .of teeth in the gear wheels of the train, the form and pitch of the .cam .45, and the position of the nut 38in the arm 3.9 with respect to the pivot .4! of the lever 40.

In Figs. 6 to :9, 'I'have illustrated another embodiment of my invention wherein the movement of the reciprocatory racks is effected by a positive crank movement instead of by the cam and "In Figs. 6 to ,9, the reference numerals used to identify the several parts are the same as those used to indicate the corresponding parts in the previously described embodiment. In thiscase, the shaft 43, instead of carrying a cam, is provided with a bevel gear 56, and this gear meshes with a second bevel gear E l which is supported on a shaft 52 journaled on the carriage 3. To the inner end of the shaft 52 is secured an arm '53 which has a dovetailed way 56 diametrically disposed for reception of a dovetailed nut 55. This nut is engaged by an adjusting screw 56 which is To.- tatably secured in the arm 53 and by means .of

which the said nut may be adjusted in the guide 54 radially with respect to the axis of the shaft 52. The nut 55 constitutes a crank which is operatively connected through a connecting rod 51 with the rack 33 as shown. Reciprocation of the rack 33, therefore, is effected by the rotary movement of the crank 55, the extent of movement of the rack being controllable by adjustment of the crank 55 radially with respect to the axis of the shaft 52, as previously set forth. In this case, a spring 58, confined under tension between the carriage 3 and the rack 33, exerts resilient pressure to hold the latter element in predetermined position in its guides on the said carria e- .all other essential respects the mechanism illustrated in Figs. 6 to 9 is the same as that shown "in the preceding figures and previously described. There is, however, a slight modification of the means for disengaging the pawls 2s. th s case, the p wl s onnected to a lever arm 59, the free end of which enga es a earn an adiustabl -y supported on the hub of the ear wheel .23. A spring 6| normally holds the lever 59 in engagement with the cam. By ad- Jus ine t e cam to different positions, the pawl 24 :may be made to engage or disengage the ratchet 2] as illustrated.

It is to be .noted that in both of the illustrated embodiments, the in-feed mechanism is operative without adjustment in both directions of traverse movement.

I claim:

1. ;In a grinding machine, the combination with a bed, of a carriage traversable on said bed, a grinding wheel, a support for said wheel on the carriage, said support be ng hinged for movement in planes transverse to the direction of said traverse, a threaded element engaged with said support and reactive with the carriage to determine the angular position pf the support with respect to the hinge axis, a gear on said threaded element, a rack on said bed, and mechanism on the carriage and operativcly connecting said gear and rack for converting the traverse movement of said carriage into rotational movement of said threaded element, said mechanism comprising a gear engaged with the rack, a reciprocatory rack, adjustable mechanism for connecting the lastnamed gear with the movable rack, and ratchet mechanism for operatively connecting the movble rack with the gear first named.

2, In a grinding machine, the combination with a bed, of a carriage traversable on said 'bed, a g inding wh el, a support for said wheel on the carria e, s id support being hinged for mov ment in planes transverse to the direction of said traverse, a threaded element engaged with said support and reactive with the carriage to determine the angular position of the support with respect to the hinge axis, a gear on said threaded element, a :rack on said bed, and mechanism on the carriage and operatively connecting said gear and rack for converting the traverse movement of said carriage into rotational movement .of said threaded element, said mechanism including a reciprocatory rack, a gear engaged with said rack, a ratchet wheel operatively connected with the gear first named, a pawl mounted on the secondnamed gear for engagement with the ratchet, and means for disengaging said pawl so as to permit manual actuation of the ratchet independent of the pawl-carrying gear.

3. In a grinding machine, the combination with a bed, of a carriage traversable on said bed, a

grinding wheel, a support for said wheel on the carriage, said support'being hinged for movement in planes transverse to the direction of said traverse, a threaded element engaged with said support and reactive with the carriage to determine the angular position of the support with respect to the hinge axis, a gear on said threaded element, a rack on said bed, and mechanism on the carriage and operatively connecting said gear and rack for converting the traverse movement of said carriage into rotational movement of said threaded element, said mechanism comprising a gear engaged with said rack, a cam connected with said gear, a lever operatively associated with said cam for oscillation by the latter, a member adjustable on said lever with respect to the fulcrum thereof, a reciprocatory rack, means for connecting said adjustable member with the rack whereby oscillation of the lever results in a reciprocation of the rack, and ratchet means for operatively connecting said rack with the gear first named. v,

4. In a grinding machine, the combination with a bed, of a carriage traversable on said bed, a grinding wheel, a support for said wheel on the carriage, said support being hinged for movement in planes transverse to the direction of said traverse, a threaded element engaged with said sup port and reactive with the carriage to determine the angular position of the support with respect to the hinge axis, a gear on said threaded element, a rack on said bed, and mechanism on the carriage and operatively connecting said gear and rack for converting the traverse movement of said carriage into rotational movement of said threaded element, said mechanism comprising a gear engaged with said rack, an adjustable throw crank operatively connected with said gear for actuation by the latter, a reciprocatory rack operatively connected with said crank, and ratchet means for operatively connecting the reciprocatory rack with the gear first named.

5. In a grinding machine, the combination with a bed, of a carriage traversable on said bed, a pair of grinding wheels, a support for each of said wheels at opposite sides respectively of the carriage, said supports being hinged for movements in planes transverse to the direction of said traverse, a threaded element engaged with each of said supports and reactive with the carriage to determine the angular positions of the supports with respect to the hinged axes, a rack on said bed, a gear on the carriage engaged with said rack, mechanism including a reciprocatory rack mounted on the carriage for operatively connecting one of the said threaded elements with the gear, a second reciprocatory rack on the carriage operatively connected to the other of said threaded elements, and means for uniting said reciprocatory racks.

6. In an automatic in-feed for the cutting wheel of a cylindrical grinding machine of the type employing a hinged support for said wheel movable on said hinge to and from the work; the combination with a carriage for said support traversable longitudinally with respect to the work, a screw element associated with the carriage and the support and operative to control the angular position of the support about the hinge axis, and mechanism operated continuously by the traverse movement of the carriage for turning the said screw to progressively feed the wheel to the work during the traverse movement of the carriage.

7. In an automatic in-feed for the cutting wheel of a cylindrical grinding machine of the type employing a hinged support for said wheel movable on said hinge to and from the work; the combination with a bed, of a carriage for said support traversable on the bed longitudinally with respect to the Work, a screw element associated with the carriage and the support and operative to control the angular position of the support about the hinge axis, and mechanism operated continuously by the traverse movement of the carriage for turning the said screw to progressively feed the Wheel to the work during the traverse movement of the carriage, said mechanism comprising a rack on said bed, a gear on the carriage in engagement with the rack, and transmission mechanism operatively connecting the gear with the said screw element.

8. In an automatic in-feed for the cutting wheel of a cylindrical grinding machine of the type employing a hinged support for said wheel movable on said hinge toand from the work; the combination with a bed, of a carriage for said support traversable on the bed longitudinally with respect to the work, a screw element associated with the carriage and the support and operative to control the angular position of the support about the hinge axis, a rack supported for longitudinal reciprocation on the carriage, transmission mechanism operatively connecting the rack with the screw element, whereby reciprocation of the rack may turn said element to change the said angular position of the wheel support, a relatively fixed rack on the said bed, and transmission mechanism supported on the carriage and operatively connecting the said relatively fixed and relatively movable racks, whereby the traverse movement of the carriage operates continuously to reciprocate the said lastnamed rack.

9. In an automatic in-feed for the cutting wheel of a cylindrical grinding machine of the type employing a hinged support for said wheel movable on said hinge to and from the work; the combination with a bed, of a carriage for said support traversable on the bed longitudinally with respect to the work, a screw element associated with the carriage and the support and operativeto control the angular position of the support about the hinge axis, and mechanism operated continuously by the traverse movement of the carriage for turning the said screw to progressively feed the wheel to the work during the traverse movement of the carriage, said mechanism comprising a rack supported for longitudinal reciprocation on the carriage, a relatively fixed rack secured to the bed, a gear on the carriage engaged with said relatively fixed rack, transmission mechanism operatively connecting the gear with the reciprocatory rack, whereby rotation of the gear efi'ects a reciprocation of said rack, a gear secured to said screw element, and mechanism for operatively connecting said gear with the reciprocatory rack, whereby the reciprocation of the rack effects a rotation of the screw element to change the angular position of the wheel support.

10. In an automatic in-feed for the cutting wheel of a cylindrical grinding machine of the type employing a hinged support for said wheel movable on said hinge to and from the work; the combination with a bed, of a carriage for said support traversable on the bed longitudinally with respect to the work, a screw element associated both with the carriage and the support so as to control the angular position of the support about the hinge axis, a gear on said screw element, a rack on said bed, and. mechanism on the carriage operatively connecting the said gear and the rack and operating continuously during the traverse movement of the carriage to convert said traverse movement into rotational movement of the said screw element.

11. In an automatic in-feed for the cutting wheel of a cylindrical grinding machine of the type employing a hinged support for said wheel movable on said hinge to and from the work; the combination with a bed, of a carriage for said support traversable on the bed longitudinally with respect to the work, a screw element associated both with the carriage and with the support so as to control the angular position of the support about the hinge axis, a gear on said screw element, a rack on the bed, mechanism on the carriage connecting said gear and. rack and. operating continuously during the traverse move ment of the carriage to convert the said traverse movement into rotational movement of the screw element, and means for adjusting said mechanism to vary the ratio between the said traverse and rotational movements.

JOSEPH HAR'IMAN. 

